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997251891 = 3691481067
BaseRepresentation
bin111011011100001…
…101101100110011
32120111111122102020
4323130031230303
54020244030031
6242542322523
733466333626
oct7334155463
92514448366
10997251891
11471a17119
12239b89443
1312b7b739c
1496633dbd
155c83c096
hex3b70db33

997251891 has 8 divisors (see below), whose sum is σ = 1331596224. Its totient is φ = 663871080.

The previous prime is 997251847. The next prime is 997251929. The reversal of 997251891 is 198152799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 997251891 - 29 = 997251379 is a prime.

It is a super-2 number, since 2×9972518912 = 1989022668206151762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (997251811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238461 + ... + 242606.

It is an arithmetic number, because the mean of its divisors is an integer number (166449528).

Almost surely, 2997251891 is an apocalyptic number.

997251891 is the 19973-rd centered pentagonal number.

997251891 is a deficient number, since it is larger than the sum of its proper divisors (334344333).

997251891 is a wasteful number, since it uses less digits than its factorization.

997251891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481761.

The product of its digits is 408240, while the sum is 51.

The square root of 997251891 is about 31579.2952897939. The cubic root of 997251891 is about 999.0831232606.

The spelling of 997251891 in words is "nine hundred ninety-seven million, two hundred fifty-one thousand, eight hundred ninety-one".

Divisors: 1 3 691 2073 481067 1443201 332417297 997251891